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0x0000007BBSODCritical

0x0000007B — Inaccessible Boot Device | Blue Screen Fix Guide

INACCESSIBLE_BOOT_DEVICE

Windows 10Windows 11

What Does 0x0000007B Mean?

Windows lost access to the boot device during startup. The system partition cannot be accessed.

Real-World Causes

  1. 1Changed SATA/AHCI/RAID mode in BIOS
  2. 2Corrupted or missing storage driver
  3. 3Failed boot drive
  4. 4Windows update changing boot configuration

Symptoms

  • ⚠Blue screen with stop code INACCESSIBLE_BOOT_DEVICE
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Use Windows Recovery Environment
  3. 3Run Startup Repair
  4. 4Rebuild BCD with bootrec commands

Advanced Fix

For experienced users and IT professionals

  1. 1Rebuild BCD store manually
  2. 2Use bcdedit to verify boot configuration
  3. 3Repair Master Boot Record with bootrec /fixmbr
  4. 4Reinstall Windows if boot files are corrupted

Frequently Asked Questions

What causes INACCESSIBLE_BOOT_DEVICE?
Windows lost access to the boot device during startup. The system partition cannot be accessed.
Can I fix Inaccessible Boot Device myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x000000EDUnmountable Boot Volume0x00000053No Boot Device

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.